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                [USACO2011 Open]forgot                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><font face="Times New Roman" size="3">发生了这么多，贝茜已经忘记了她cowtube密码。然而，她记得一些有用的信息。 <br />
首先，她记得她的密码（记为变量P）长度为L（1 &lt;= L&lt;=1,000）字符串，并可以被分成 一个或多个词（不一定是唯一的），词来自于字典中NW（1&lt;=NW&lt;=1,000）个独特的词。 一个词W_i，被定义为一个长度1..20的小写字母序列('a'..'z')。 <br />
她还记得她密码中某些字母的位置。 请看下面的例子。贝西知道她的密码看起来像&quot;a??l?ban???????&quot;（'？'代表一个字母，她不记得）， <br />
她的字典里有下面的词： <br />
apple <br />
cow <br />
farmer <br />
banana <br />
bananas <br />
pies <br />
贝西有两个可能的密码是的&ldquo;applebananapies&rdquo;和&ldquo;applebananascow&rdquo;。 <br />
给你字典，贝西记得的字母，请找到她的密码。如果有一个以上的密码是可能的，找到字典序最前的。 <br />
</font></p></p><hr/><h3>输入格式</h3><p><p><font face="Times New Roman" size="3">*第1行：两个空格分隔的整数：L和NW <br />
*第2行：一个字符串，长度为L：P <br />
*第3..N+2W行：第I+2行包含在字典中的第i个字：W_i</font></p></p><hr/><h3>输出格式</h3><p><p align="left"><font face="Times New Roman" size="3">*第1行：密码</font></p></p><hr/><h3>样例输入</h3><pre>15 6
a??l?ban???????
apple
cow
farmer
banana
bananas
pies
</pre><hr/><h3>样例输出</h3><pre>applebananapies
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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